@article{10_37236_6070,
     author = {Reinhard Diestel},
     title = {A simple existence criterion for normal spanning trees},
     journal = {The electronic journal of combinatorics},
     year = {2016},
     volume = {23},
     number = {2},
     doi = {10.37236/6070},
     zbl = {1336.05030},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/6070/}
}